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Related Concept Videos

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Indirect generation involves an...
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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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Homologous Recombination02:31

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Related Experiment Video

Updated: May 13, 2026

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
11:30

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

Published on: March 6, 2017

Cosmic microwave background bispectrum from recombination.

Zhiqi Huang1, Filippo Vernizzi

  • 1CEA, Institut de Physique Théorique, F-91191 Gif-sur-Yvette cédex, France, CNRS, Unité de recherche associée-2306, F-91191 Gif-sur-Yvette cédex, France.

Physical Review Letters
|March 26, 2013
PubMed
Summary
This summary is machine-generated.

We computed the cosmic microwave background temperature bispectrum using a second-order Boltzmann code. This analysis reveals nonlinear effects at recombination, impacting cosmological parameter estimation.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Related Experiment Videos

Last Updated: May 13, 2026

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
11:30

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

Published on: March 6, 2017

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

  • Cosmology
  • Astrophysics
  • Cosmic Microwave Background Radiation

Background:

  • Nonlinearities at recombination generate the cosmic microwave background (CMB) temperature bispectrum.
  • Understanding these nonlinear effects is crucial for precise cosmological parameter estimation.

Purpose of the Study:

  • To compute the full-sky CMB temperature bispectrum on all scales, accounting for nonlinearities at recombination.
  • To assess the impact of these nonlinearities on cosmological measurements and parameter inference.

Main Methods:

  • Utilized CosmoLib2nd, a numerical Boltzmann code operating at second order.
  • Calculated the CMB bispectra across the full sky, excluding gravitational lensing for this analysis.

Main Results:

  • The computed bispectrum is peaked on squeezed triangles, showing agreement with analytic approximations.
  • On smaller scales, results align with previous studies on perturbed recombination.
  • A signal-to-noise ratio of 0.47 was found for cosmic-variance limited data to l(max)=2000, corresponding to an effective non-Gaussianity parameter f(NL)(eff) of -2.79.

Conclusions:

  • The nonlinear bispectrum introduces a bias of approximately f(NL)(loc) = 0.82 to local non-Gaussianity measurements.
  • These findings are important for interpreting CMB data and constraining inflationary models.